The Collaborative International Dictionary of English v.0.48:

Infix \In*fix"\, v. t. [imp. & p. p. Infixed; p. pr. & vb. n.
   Infixing.] [L. infixus, p. p of infigere to infix; pref.
   in- in + figere to fix: cf. F. infixer. See Fix.]
   1. To set; to fasten or fix by piercing or thrusting in; as,
      to infix a sting, spear, or dart. --Shak.
      [1913 Webster]

            The fatal dart a ready passage found,
            And deep within her heart infixed the wound.
                                                  --Dryden.
      [1913 Webster]

   2. To implant or fix; to instill; to inculcate, as
      principles, thoughts, or instructions; as, to infix good
      principles in the mind, or ideas in the memory.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "infixed":
   chronic, confirmed, deep-dyed, deep-engraven, deep-fixed,
   deep-grounded, deep-laid, deep-rooted, deep-seated, deep-set,
   deep-settled, dyed-in-the-wool, embedded, embossed, engrafted,
   engraved, entrenched, esoteric, established, etched, fast,
   firmly established, fixed, graven, immanent, implanted, implicit,
   impressed, imprinted, inalienable, incorrigible, inculcated,
   indelibly impressed, indwelling, ingrained, ingrown, inherent,
   inner, instilled, internal, intrinsic, inveterate, inward,
   inwrought, irreducible, irreversible, long-established, old-line,
   on a rock, on bedrock, private, resident, rooted, secret, set,
   settled, settled in habit, stabilized, subjective, thorough,
   unalienable, unchallengeable, unquestionable, vested,
   well-established, well-founded, well-grounded, well-set,
   well-settled